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2. The space between the plates of a parallel plate capacitor is filled with two slabs of dielectric material. The dielectric filling the space between the grounded bottom plate at z=0 up to z=d/2 is of dielectric constant while that filling the space from z=d/2 up to the upper plate at z=d which is maintained at a constant potential
is of dielectric constant
. Find an expression for the potential between the plates and the polarization charge density on the two plates.